Mechanical movement.



G. J. ROBERTSON.

MECHANICAL MOVEMENT.

APYLIOATION FILED MAR. 21, 1905. nmmwnn Jun: 4, 190a.

945,1 99, Patented Jan. 4, 1910.

4 SHEETS-SHEET 1.

.27 6 (926501": "unh zesaes: aipubeafswq C. J. ROBERTSON.

MECHANICAL MOVEMENT.

APPLICATION FILED MAR. 21, 1905. RENEWED JUNE 4, 1909.

945, 1 99. Patented Jan. 4, 1910.

4 SHEETS-SHEET 2.

fr l; Z7z Jazz/'06.- g 6' IF 0&66/59'0/1 waavb v i/aflar/i 5 6 LL14. I I

G. LRQBERTSON. MECHANICAL MOVEMENT. APPLICATION mum an. 21, 1905. nnnnwnn mm: 4, 1909;

Patented Jan. 4, 1910.

4 SHEETS-SHEET 3.

IIIIIIIIIIIIIIIIIIA lllllll flll f.

vllIlIl/IIII/ II -176 (A16 06; OJRJAGCfEad i gM/s flaw/1e .9.

' Wfiesses:

G. J. ROBERTSON.

. MECHANICAL MOVEMENT.

APPLICATION I'ILED MAB. 21.1905. mmnwnn mm: 4, 1009.

945,199. 9 Patented Jan.4, 1910.

4 SHEETS-SHEET 4.

Jim/e; a law a 6 9?? a H 4 Fafieel'sa/z w: idea/w .9 i I f a 5 UNITED STATES TPATENT OFFICE.

CHARLES .1. nosnn'rson, or TAUNTON, massaouns'n'r'rs, assronon T0 rm: cmrnnm.

PRINTING rnsss & manorac'runme oomrmr, or new Yonx, N. Y., .a consona- 'LION OF NEW YORK.-

MECHANICAL movnmnn'r.

Specification of Letters Patent.

Patented Jan. 4, 1910.

Application filed March 21, 1905, Serial No. 251,207. Renewed June 4, 1909. Serial No. 500,122.

To all whom it may concern:

Be it known that I, CHARLES J. ROBERT- SON, a subject of the King of En land, residing at Taunton, in the county of ristol and State of Massachusetts, have invented a new and useful Mechanical Movement, .of which the following is a specification.

This invention relates to that classof mechanical movement which converts rotary into reciprocatin motion and which is especially adapte to move the reciprocating beds of; printing presses or for use in other heavy machinery.

The especial object of this invention is to provide a mechanical movement employing a crank-actuated reversing mechanlsm in which the crank element has a radial movement as well as a movement of revolution.

To this end, this invention consists of the mechanical movement and of the combination of parts therein as hereinafter described '15 a partial cross sectional view illustrating in detail part of the main driving mechanism. Fig. 2 is a detail view of the connections for raising and lowering the impression cylinder. Fig. 3 is a deta1l view of the reversing mechanism. Fig. 4 is a transverse sectional view of the same. Fig. 5 is-a detail view of the connections for raising and lowering the reversing slide. 6 1s a perspective view. of the frame wh ch carries the variable throw wrist-pin. Fig. 7 1s a detail view of the partial external gear having slots for the frame which carries the variable throw wrist-pin. Fig. 8 1s a detail view of the connections for shifting the main, shaft. Fig. 9 is a diagrammatic view showing the position of the parts at the end of a constant speed movement and at the beginning of thereversing movement at one end of the press. Fig. 10 1s a dlagrammatlc view showmg the pos1tion of the parts when the bed. is at the limit of its travel in one d1- rection. Fig. 11 is a diagrammatic view showing the position of the parts upon the completion 0 a reverslng movement and at the commencement of the uniform rinting stant speed printing stroke and at'the beginning of a reversal movement. Fig. 13 1s a diagrammatic view showing the position of the parts when the bed has reached the limit of movementof its printing stroke, and, 14 is a diagrammatlc view showing the os1- tion of the parts at the complet1on-o the reversal and at the beginnin of the constant speed return movement of t e bed.

A mechanical movement of the. class to which this invention relates, comprises a main driving mechanism forgiving the bed its main forward and backward motions and a reversing mechanism for reversing the motion of the bed at each end of its travel. The reversing mechanisms which have heretofore been employed in constructions of this class are crank o erated and, as heretofore constructed, eac reversal of the bed has occupied a half-turn or'less of the crank. In large sized printing presses, it is desirable to allow more time for reversals. In a companion application for patent, which I'have filed of even date herewith, Serial No. 251,205, and which I have executed on even date herewith, I have shown how this can be" accomplished by the use of pitman connect1ons;'that is to say, in my companion application for patent, I have shown a revers ng mechanism which operates formore than a' half-turn of the crank at each reversal'by using the sweet side of a pitman reverse. M

The words sweet side are used to' designate the reversing movement obtained from a pitman which is lon er and easier than the, reverse obtained on t e other side.

The especial object of my present inven tion is to provide a crank reversing mechanism. whic comprises a crank element ar ranged to operate for more than a half-turn at each reversal by having a radial movement, which movement I term a radial throw.

In the particular construction which I have illustrated herein, I employ the same main driving mechanism as in my application for patent filed October 6, 1904, Serial No. 227,344, and I have arranged the radial throw-crank reversing mechanism to produce the same movements which would be produced by the using of the sweet side of a pit-man connection. H

Referring to the drawings for a detailed description of the construction, A designates the usual frame-work which carries the reciprocating bed B. The impression cylinder C has its shaft journaled in eccentric bushings 10. Mounted on the impression cylinder is a gear 11 which meshes with a driving gear 12 to which power may be applied in any suitable way: The driving gear 12 is fastened on a main shaft 14' which is journaled in an eccentric bushing 15 fitted in the framework A. A partial internal gear 17 -is secured on the end of the main shaft 14.

A driving shaft 18 is 'journaled in the framework of the machine and carries a driving pinion 19 which is in constant mesh with a rack 20 secured to the bed as shown in Fig. 4.

Secured on the main shaft 14 is a partial external or spur gear 32. As shown in Fig. 1, the driving shaft 18 is provided with a gear 21' which cooperates with the external gear 22 'andalso fastened on the driving shaft 18 is a gear 23 which cooperates with the internal gear 17. The partial internal gear 17 and the partial external gear 22 occupy substantially similar angular positions on the main shaft 14.

The mechanism, as thus far described, constitutes a main driving mechanism and is of substantially the same construction as shown in my application Serial No. 227,344 before referred to. I

' When the main shaft 14 is shifted in one direction by its eccentric bushing 15, the partial internal gear 17 will engage the gear 23 on the driving shaft 18 and will turn the main driving pinion 19 to move the bed during a constant speed printing stroke. When the main shaft 14 is moved in the opposite direction by its eccentric bushing 15, the partial external gear 22 will 4 engage the gear 21 and will turn the driving pinion 19 in the opposite direction to move the bed on its constant speed return movement. This main driving mechanism is designed so that the constant speed movements in opposite directions will take place for equal distances and for equal times. In this application for patent, I do not wish to claim specifically this particular comstruction of main driving gear, as this subject matter is claimed in my application Serial No. 227,344 for patent beforereferred to.

The reversing mechanism I have designed for the purpose of allowing more time to reversals is actuated from a radial throw crank which may be mounted and arranged as illustrated more particularly in the'second sheet of drawings. v

As shown in Fig. 7, the partial external gear 22 is provided with slots for carrying the frame of a variable throw-wrist-pin. The frame as illustrated in Fig. 6 comprises a plate 24 having studs 25 which fit the slots in the gear 22 and the frame is held in place by clamp plates 26. Extending from one of the.clamp plates 26 is a pin 27 carrying a roller which fits into the groove in a cam 28. As shown in Fig. 4. the cam 28 is arranged to move up and down with the main shaft 14 when the same is shifted by reason of its eccentric bushings 15 and the cam plate 28 itself is held from turning by means of a pin 29 fixed in the framework. Extending in the opposite direction from the pin 27 is the variable throw wrist-pin 30 which carries a block fitted into the vertical slot 31 in the independently moving member or slide 32.-

The slide 32 as shown in Fig. 3 is mounted on a guide block 33 which is pivoted into a fixed stud and on a guide block 34 which is mounted on an eccentric 35 carried by a shaft 36. By means of this construction, when the shaft 36 is turned (for example, by means of connections hereafter described) the slide 32 will be rocked or tipped. Carried by the slide 32 are top and bottom racks 37 and 38. Cooperating with the top and bottom racks 37 and 38 is a gear 58 fastened on a driving shaft 18. By means of this construction when the end of the slide 32 is tip ed or raised as illustrated in Fig. 3, the ottom rack 38 will engage the gear 58 to accomplish the reversal of the bed at one end of its movement and when the end of the slide is lowered or tipped down, the top rack 37 will engage the gear 58 to accomplish the reversal of the bed at the other end of its movement: Any desired connections may be employed for turning the eccentric bushings which raise and lower the impression cylinder, which shift the main shaft 14, and which tip or tilt the slide 32. As illustrated in ,Fig. 2, the eccentric bushings 10 of the impression cylinder C may be operated bylinks 67 connecting to arms 68 extending from a shaft. Extending -up from this rock shaft is an arm which is connected by a link 69 to a lever 40, which lever 40 is operated by a cam 41.. the main driving shaft 14 its eccentric bushing 15 may be provided With a partial gear meshing with a sector carried by a lever 42, which lever 42 is operated by a cam 43.

To shift slide 32 com rise a artial gear extending from the she t 36 and meshing with a sector carried by a bell-crank lever 44. The other arm of the bell-crank lever 44 is engaged by a cam 45.

Considerin now the operation of the reversing mec anism, the reversing action limit of 1ts travel as shown in Fig. 10.

\Vhen the bed is started on its return travel,

the cam at first shortens the crank radius of the radial throw wrist-pin, the variation of the crank radius of said wrist-pin being such that the bed is given an eas startin movement until the wrist-pin as ma e more than a half-turn from its position at the beversmg action commences before the radial been brought into proper throw-wrist-pin passes over the center of the main driving shaft and the cam controlling the radial throw-wrist-pin changes its crank radius so that the bed will be given an eas stopping motion until it reaches the en of its travel as shown in Fig. 13. Then the bed is started back on its return movement, the cam at first, gradually decreasing the crank radius of the variable throw wristin andthen changing the same so that the iied will be started back with an. easy starting motion until the arts reach the position shown in Fig.1; w en the bed Wlll have osition and will be traveling at proper spee to commence its constant speed return movement.

- In the particular construction I have herein illustrated I have roportioned the cam to produce substantia ly the same motions that would be reduced by em loying a itman. It is to e understood, owever, t at I do not wish to be limited to the particular throw crank reverse mechanism, it being obs vious that considerable varieties may be used by utilizing various cams or other means for shifting the radial throw wrist-pin.

In this-application for patent I do not wish to claim broadly a mechanical movement in which reversals occupy longer times than the constant speed movements, as that is claimed in my com anion application for patent beforereferr to.

I am aware that many changes may be made in racticing my mvention by those who are illed inthe art without departing from thescope of, my invention as ex ressed in the claims. I do not wish, there ore, to

'be limited to the constructionIhaveiherein shown and described, but

What I do claimand desire to secure by 2. A mechanical movement comprising a main driving mechanism and a radial throw crank-actuated reversing mechanism 'con-' nected to operate for more than a half turn for a reverse.

3. A mechanical movement com rising a main driving mechanism and a radial throw crank-actuated reversin mechanism connected to reverse the be at the ends of its travel in either direction and to act for-more than a half turn foreach. reversing movement'.

4. A two-revolution mechanical movement for converting rotary into reciprocating movement, comprising a main driving mechanism for imparting a uniform to-and fro movement to a reciprocatin member, a crank reversing mechanism or impartingw the reversing movement, and means whereby the crank reversing mechanism sh 11 act between the uniform movements for more than a half turn. n

5. A mechanical movement comprising a main driving mechanism, a wrist-pin, means for changing the crank radius of the wristpin, and means for connecting the wrist pin to efl'ect a reversal during. more than a half turn thereof. I v i 6. In a mechanical movement the combination of the moving member, a rack carried thereby, a driving pinion engaging said' throw wrist-pin, and a cam for changing.

the crank radius of the wrist-pin.

8, In a mechanical movement the comb nation of a mam driving mechanism and a reversing mechanism comprising a radial.

throw wrist-pin, a cam for changing the crank radlus of the wrlstin, and means for connecting the wrist-pin o effect a reversal durinlg more thana half turn thereof.

9. n a two-revolution "mechanical move: ment, the combination of a maindrivin mechanism and radial throw'crank-actua reversing mechanism baiting. reversal move ments occupying'more' time" than the constant s eed'movements.- Y

10. n a mechanical movement,

bination of a, main driving mechanism comparta reversing movement to the bed durprising a main shaft, a partial internal gear, in-g more than a half turn of the wrist-pin.

a partial external gear, a driving pinion en- In testimony whereof I have hereunto setgaging a rack on the moving member and my hand, in the presence of two subscribing 5 pinions engaged by the internal gear and witnesses.

external gear respectively and a reversin mechanism comprising a rzidial throw Wrist ROBERTSON pin turning with the main shaft, a cam vary- .lVitnesses: Y

ing the crank radius of the wrist-pin and ROBERT T. J0HNsToN,

10 means for connecting the wrist-pin to im- FRED J. VIEWEG. 

